Do those people really believe they're the most intellectually superior to the rest of the world? If a job can be done purely remotely, what stops the employer from hiring someone who lives in a cheaper place?
A lot of that stems from a lack of job security. Stuff like suddenly being locked out of your work email/slack or being escorted out of company premises is largely unheard of in the rest of the world.
As a point of comparison: I'm a contractor based in a popular outsourcing destination. My contract is extended well over a month before it expires and I would need to do something particularly harmful to be let go just like that, as our client values continuity of services and will hold the agency accountable should that suffer.
Over here if a job listing mentions "US client" it typically means considerably more work for considerably more pay. Some go for that, others opt for more relaxed roles. I can't imagine having US jobs as the only option.